Carbon capture solvents and methods for using such solvents

Abstract

A solvent for recovery of carbon dioxide from gaseous mixture having at least amine, and at least one salt of an amino carboxylic acid or amino sulfonic acids. One specific solvent contains less than about 75% by weight of water and has a single liquid phase.

1 . A solvent for recovery of carbon dioxide from gaseous mixture, comprising:
 (a) At least amine, and   (b) At least one salt of an amino carboxylic acid or amino sulfonic acids, wherein one specific solvent contains less than about 75% by weight of water and has a single liquid phase.   
     
     
         2 . The solvent as claimed in  claim 1 , wherein the amine is selected from hindered amines. 
     
     
         3 . The solvent as claimed in  claim 1 , wherein the amino sulfonic acid is a taurine and the salt is a taurate. 
     
     
         4 . The solvent as claimed in  claim 1 , wherein the amine is an amine of the formula (I), (II) where x and y respectively satisfy relationship: 1 less than or equal to 5 and 2 less than or equal to 10; and R 1 , R 2 , R 3 , and R 4  represent —C i H j O k N l  (where i=0 to 10, j=1 to 21, k=0 to 5, and l=0 to 5). 
       
         
           
           
               
               
           
         
       
     
     
         5 . The solvent as claimed in  claim 1 , wherein the amine is selected from cyclic amine which are either secondary amine or tertiary amines. 
     
     
         6 . 
     
     
         7 . The solvent as claimed in  claim 1 , wherein the amine is selected from the group consisting of monoethanolamine (MEA), methyldiethanolamine (MDEA), diethanolamine (DEA), triethanolamine (TEA), diisopropanolamine (DIPA), 2-amino-1-propanol (AP), 2-amino-2-methylpropanol (AMP), ethyldiethanolamine (EDEA), 2-methylaminoethanol, 2-ethylaminoethanol (EAE), 2-n-propylaminoethanol, 2-nbutylaminoethanol (n-BAE), 2-n pentylaminoethanol, 2-isobutylaminoethanol (IBAE), 2-dimethylaminoethanol (DMAE) and 2-diethylaminoethanol (DEAE), N,N-diethylethanolamine, 2-amino-2-methyl-1,3-propanediol (AMPD), 2-amino-2-methyl-1,3-propanediol (AHPD), 2-amino-2-ethyl-1,3-propanediol (AEPD), and combination thereof. 
     
     
         8 . The solvent as claimed in  claim 1 , wherein the amine is selected from the group consisting of 2-amino-2-methyl-1,3-propanediol (AMPD), methyldiethanolamine (MDEA), 2-amino-2-methylpropanol (AMP) and combinations thereof. 
     
     
         9 . The solvent as claimed in  claim 1 , wherein the amine is 2-amino-2-methyl-1,3-propanediol (AMPD) and the molar concentration of AMPD is between about 0.5 M to about 4 M. 
     
     
         10 . The solvent as claimed in  claim 1 , wherein the salt is potassium salt. 
     
     
         11 . The solvent as claimed in  claim 1 , wherein the salt of amino carboxylic acid or sulfonic acid selected from the group consisting of: potassium taurate, potassium glycinate, potassium alkalinate, potassium prolinate, potassium N—N dimethyl glycinate, potassium 3-dimethyl aminoproponate, potassium dimethyl aminoisobutyrate potassium aminoisobutyrate, potassium methylamino isobutyrate potassium taurate, and combination thereof. 
     
     
         12 . The solvent as claimed in  claim 11 , wherein total molar concentration of potassium taurate is 0.1M to 3.5 M. 
     
     
         13 . A method for removing CO 2  from a stream, comprising the steps of:
 (a) contacting the stream with a solvent having an Amine, salt of amino carboxylic acid or salt of amino sulfonic acid;   (b) allowing one specific solvent to absorb CO 2  at a temperature;   (c) regenerating one specific solvent from heating one specific solvent greater than 80.   
     
     
         14 . The method as claimed in  claim 13 , wherein the stream has a temperature between 40 C to 65 C. 
     
     
         15 . The method as claimed in  claim 13 , wherein the amine is amino-2-methyl-1,3-propanediol (AMPD) and the salt of the amino sulfonic acid is taurate.